Exhaust-pipe tailpiece



Nov. 16 192s. 1,607,003

R. 0. KING EXHAUST PIPE TAILPIECE Filed Dec. 5 1925 p of the members 2and 3.

i (and is preferably less) than the effective or adapter 11, (see Figure7),

' 12,13 and or strips seated in the recesses 8 and 9 in the longitudinalmembers 2 and 3. These linings areseparate at their inner ends by meansof the clamps 20, 21, secured by rivets 22, 23 to the interior Thelinings 18, 19 are continued through the exit 14 from the diffuserchamber and are shown anchored outside the said exit by means of rivets24, 25; these rivets pass through cross strips of stiffening material26, through the end of the asbestos 18 or 19 which is represented asfolded back over said strip 26, and through the lip-or flange 5, 5The-asbestos between the anchorage points 22, 23 and 24, 25, isarranged, loosely to act in a blanketingmanner upon the stream of gaspassing through the attachment B. The asbestos tapes may be stifl'enedat their edges by inserted wires if desired, such wire stifiening forasbestos being well known.

Throughout the length of the diffuser chamber 10 the cross-sectionalarea of the passageway formed by the conjoined recesses 8-9 taking intoaccount the linings 18, 19, is such that it is little if any greaterarea of the exhaust port or ports from any one cylinder which dischargesinto pipe A. The area of the effective outlet of the asbestos-lined exit14 is therefore preferably somewhat less than that of the eflective areaof the said exhaust'port.

By reason of the outwardly flared walls the greater depth of therecessed members 2, compared with the depth of the recessed members atthe part comprised between the arallel walls 15, 16 viz, the diffuserchamer, I am enabled to use asbestos tapes of constant width throughouttheir length. -The cross distance from the centre of .the

flange 6 to the centre of the flange 7 following the sides and base ofthe member 2 or 3 is the same throughout the length of the attachment.In other words, because of the tapered but flared walls of theantechamber parallel-sided tapes 18 or 19 adequately line the members 2and 3 at for example, line 6-6 of Figure 5 as well as at line 7-7 ofthat figure. Further by reason of the angle between the walls of thetapered adapter chamber 11 and the diffuser chamber. 10, the asbestostapes which are anchored at their extremities fit intermediate of theirlength snugly against the recessed members 2 and 3 and adhere loosely tothe said members in the manner of a blanket.

The attachment B is with advantage secured to the pipe A in thefollowing manner. A nut 17 is screwed upon the screwthreaded end of pipeA and is pinned ereto at 17. The attachment B is provided around itsinlet 1 with inturned flanges 27,

and are shown anchored 3 at that part of the attachment wardly Thiswasher 32 is an annulus with a cy-"' lindrical portion 32 see Figure 5,and has diametrically opposite recesses 33 formed in said cylindricalportion. These recesses 33 act as jaws to engage the continuations 29,30 of the facing flanges 6, 7, and in this manner the locknut 31- whenscrewed up against the washer 32, clamps the inturned flanges 27, 28against the pinned nut 26 which latter serves as an abutment.

By slacking back the nut 31 and washer 32 and then removing the screws4, the members 2, 3, can beseparated for inspection, cleaning or.relining purposes.

In a modified form of the invention a plurality of these hollowattachments B may be secured together in series or tandem inturnedscrews 4 the exit from one diffuser chamber 10 leading into the taperedadapter chamber '11 of another. As shown in Figure 9, three of theseattachments are combined together in prolongation one of another, and inthis way I prevent a core-like stream of gas from proceedinguninterruptedly through the device.

It will be noted from the foregoing description that the adapter chamberis of such a shape that in the direction of the exhaust flow, its crosssection is tapered inon one diameter and is flared outwardly on adiameter at right angles to the said first diameter.

In other words, the op-* positely facing side walls 12, 12, 13, 13'are.

divergent, and the oppositely facing top and bottom walls. of theadapter chamber are convergent,both' the divergent and convergent wallsbeing included within the len th of-the adapter chamber.

fiaving thus-described my invention what l claim is 1. An exhaust-pipetail iece comprising a plurality of longitudina 1y recessed mem bers,each of said members including a portion of a diffuser chamber and aportion of an adapter chamber,

means for detachably assembling said members together with theirrecesses conjoined to afford a longitudinal passageway through theadapter chamber and the diffuser chamber, said adapter chamber bein ofsuch shape that in the direction of t e exhaust flow, its cross sectionis tapered inwardly on one diameter and is flared outwardly on adiameter at right an gles to the said first diameter, means for securingsaid tailpiece to the exhaust pipe, and

a lining of asbestos material secured to each Patented Nov, 16, 1926.

UNITED STATES 1,607,003. PATENT OFFICE.

ROBERT OWEN KING, O13 LONDON, ENG-LAND, ASSIGNOR' TO BELLS UNITEDASBESTOS COMPANY, LIMITED, OF LONDON, ENGLAND.

EXHAUSTPIPE TAILPIECE.

Application filed December 3, 1925, Serial No. 72,875, and in GreatBritain September18, 1925.

This invention relates to an attachment to the end of an exhaust pipefrom an internal combustion engine. object to'provide a device whichwill damp out the sound vibrations ,which make exit from the exhaustpipe, and will also be divisible for inspection, cleaning or reliningpur oses. I

y attachment consists of a hollow device including a shallow box-like,diffuser chamber with a passageway extending through the whole deviceand a slot-like exit from the diffuser chamber, which box is formed of aplurality of juxtaposed and longitudinally recessed members each linedwith asbestos. A length of asbestos is laid longitudinally of eachmember and is removably anchored at its ends to said member. Theasbestos, except at its anchorage pointsis loosely laid or arranged inposition in the recessed. members which constitute the hollow device. soas to effect-a blanket-action on the sound vibrations.

This device differs from the ordinary exhaust box or muffler inasmuchas, in the first place. the silencing is effected mainly in theslot-like exit and in order that this may be so it is necessary that ahigh velocity of the "exhaust gas be maintained in this part of thedevice so the area of cross section of this slot-like exit must belittle if any greater (and preferably less) than the effective area ofthe exhaust port or ports from any one cylinder; in the second place,the device is formed of aplurality of parts assembled together and eachlined with asbestos arranged longitudinally of the passageway. Moreover,the present invention is more in the nature of a fish tail or similarattachment to the exhaust pipe.

Other features of the present invention will be hereafter setout in theclaims.

I Upon the accompanying sheet of drawings: Figure 1 is a plan of thedevice and Figure 2 is an elevation of the exit end thereof. Figure 3 isa side elevation and Figure 4 is an elevation of the inlet end to saiddevice. Figure 5 is allongitudinal sectional elevation of Figure 3, andFigure 6 is across section on line 6-6 of Figure 5. Figure 7 is a planview of one of the recessed members without its lining, and Figure 8- isa cross section on line 8-8- of Figure 7. Figure 9 is a diagram inlongitudinal sectional elevation of a series of It has for its theseattachments arranged in series or tan-v dem.

The exhaust pipe of an internal combustion engine is indicated at A. Tothis pipe members 2 and 3. These halves are conven-- iently securedtogether by screws 4: which pass through the facing flanges 6 and 7 ofthe halves or members 2 and 3. These members 2 and 3 are provided attheir ends remote from the exhaust pipe A with lips or flanges 5, 5 Themembers 2. and. 3 are formed of metal and may be castings, stampings ormetalv shells recessed lon itudinally as at 8 and 9 so that when t esaid recesses 8 and 9 are conjoined or juxtaposed, a longitudinalpassageway 8-9 through the device is obtained with an inlet 1 andexit14. These recesses 8 and 9 in the halves 2 and 3 are of such ashape" that -when conjoined they form, adjacent to the inlet 1 into thedevice, a circular or' quasi-circular passageway. These recesses 8 and 9are further so shaped that as they proceed towards the exit end of theattachment B, the shape of the passageway changes to that of an oblongslot which may be of rectangular cross section, as will be seen inFigures 2 and 5." The walls of the members 2 and 3 are tapered down asat C inone plane and outwardlyflared as at D in a plane at right anglesto the first plane, as will be understood from Figures 1 and 3.

The halves or members 2, 3, of the hollow device are shown as anante-chamber or tapered adapter chamber (11 in Figure 7 with outwardlyflared walls 12, 12, 13, 13, leading to the diffuser chamber (10 inFigure 7), this diffuser chamber having parallel walls 15, 15, 1,6, 16.The exit 14 from the device B is in the form of an oblong slot ofconsiderably greater width than depth. The adapter 11 serves to connectthe oblong section passageway through the diffuser chamber 10 with theinlet 1 into which the exhaust gases enter.

The passageway through the hollow attachment formed by the conjoinedrecesses 8 and 9 of the assembled halves 2 and 3, is lined withasbestos, these asbestos linings 18, 19 being preferably in the form oftapes of said longitudinally recessed members,

said linings being securedpnly at their ends and, intermediately thereofbeing held loosely against the interior of the longitudinally recessedmembers.

2. An exhaust-pipe tailpiece comprising a plurality of longitudinallyrecessed metal shells having facing flanges whereby said shells may besecured together, means for rigidly and detachably securing theassembled device to said pipe, an as estos tape lining secured at itsends inside each of said shells, said shells being shaped to form' whenassembled a hollow body having at an intermediate portion of its lengthan outwardly flared passageway, and at its extremity a slot-like exit,said outwardly flared passageway being tapered from the inlet towardsthe said exit.

3. An exhaust-pipe tailpiece comprising an elongated hollow memberdivided longitudinally in halves, means for detachably securing saidhalves together, means for operatively connecting said tailpiece withthe exhaust pipe, said hollow member including a shallow diffuserchamber with parallel walls and an oblong exit, an asbestos lining foreach of said halves, said linings being secured in position only attheir ends, and said hollow member including also an adapter chamberleading to said diffuser chamber and having a pair of oppositely facingwalls converging in the direction of the exhaust flow, and another pairof oppositely facing walls diverging in the direction of the exhaustflow, said-converging and diverging walls vbeing included within thelength of the adapter chamber and merging grit the walls of the shallowdiffuser cham- 4. An exhaust pipe tailpiece comprising an adapterchamber and a shallow diffuser chamber, said diffuser chamber havingside walls and top and bottom walls, said chambers being aligned andformed in halves longitudinally secured together, the halves of saidadapter chamber beiiig of trough section with divergent side walls andconvergent top and bottom walls in the direction of the exhaust flow,said divergent and convergent walls merging with the walls of saiddiffuser chamber, parallel-sided ashes tos linings secured to theinterior of said trough-section halves, and means for'detachablysecuring said tailpiece to an exhaust pipe.

5. An exhaust-pipe tailpiece, comprising an adapter chamber and ashallow diffuser chamber, said diffuser chamber having side walls andtop-and bottom walls, said chambers being in prolongation one of theother and formed in halves longitudinally secured together, the halvesof said adapter chamber bcin of trough section with outwardly flaredside walls and inwardly tapered top and bottom merging with,respectively, the side, top and bottom walls ofthe shallow diffuserchamber, outwardly flanged terminal lips on said difl'user'chamberforming a slot like exit from the diffuser chamber, and longitudinallyarranged asbestos tapes of constant width throughout their length, saidtapes being secured as linings at one end to the interior of the halvesof the adapter chamber and at their other end inside the terminal lipsupon the diffuser chamber.

6. An elongated exhaust-pipe tailpiece comprising an adapter chamber anda shallow open-ended diffuser chamber, said diffuser chamber having sidewalls and top and bottom walls, said chambers being formed in halveswith facing'flanges longltudinally secured together, the halves of saidadapterchamber being of trough section with outwardly flared side wallsand inwardly tapered' top and bottom merging with the side walls, andtop and bottom of the shallow diffuser chamber, asbestos linings securedto the said halves of said chambers, an end wall at the inlet end ofeach half of the adapter chamber formed b -.inturned flanges integralwith said facing anges, and means for removably connecting the halves ofthe adapter chamber with the exhaust pi e, said means including an.abutment upon t e pipe and a lock nut and washer for holding said endwalls against said abutment.

In witness whereof I have signed my nameto this specification.

ROBERT OWEN KING.

